To control the basic functions of your radio without guessing, look for these visual markers on the screen: Changing language for on-screen display
Based on this research, we recommend:
Because this specific model was never sold in English-speaking markets, an official English firmware ROM does not exist.
for the CN-HW850D. Even if menu text could be translated, the map database, voice prompts, and radio/TV tuners would remain Japan‑specific. Most owners either learn the minimal Japanese icons (home, audio, nav, settings) or replace the unit.
These devices work by: